测试java连接mysql的语句

public void saveStudent(Student student) throws Exception {
// 连接数据库，完成数据的录入操作
System.out.println("---saveStudent---");
System.out.println(student.getSname());
System.out.println(student.getSpass());
Class.forName("com.mysql.jdbc.Driver").newInstance();
String dbUrl = "jdbc:mysql://localhost:3306/db_book?useUnicode=true&characterEncoding=GB2312";
String dbUser = "root";
String dbPwd = "123456";
con = (Connection) DriverManager.getConnection(dbUrl, dbUser, dbPwd);
String sql = "select * from  t_book";
rt = con.prepareStatement(sql).executeQuery();
while (rt.next()) {
System.out.println(rt.getString(2));
}
}